Improvement in casters



(time.

JOSEPH `MILLER, OF CLEAN, NE'W YORK. Letters Patent No. 86,997, dated Betreut/ry 16,' 1869.

IMPROVEMENT IN CASTERS.

The Schedule referred to in these Letters Patent and making part ofthe same.

To all whom it may concern:

of securing the same to bedsteads, tables, &c.; andthe.

following is a full, clear, and exact description of 'the same, reference being had to the accompanying drawings, making a part of this specification, in which- Figure l represents a broken-oiisection or foot of a bed-post, with a stem-caster and the parted spiral castmetal bush-holder rmly in place.

Figure 2 is a section view through the same, showing one half of the spiral caster-holder, With the neck and ball-head ou the stem ofthe caster.

Figure 3 shows a vertical half section and end view ofthe cast-metal caster-holder, detached.

Figure 4 represents the bottom of a table-leg with a metal socket, and the caster-'and spiral holder partly screwed in.

Figure 5 is a sectional view of the lstem-holder of the same, with a square end.

The object of my invention is to putin stemfcasters to bedsteads, tables, and other articles of furniture, so that they will not drop out when the article is lifted up, and still may be more easily fitted and put in, and also taken out, when required, than any other, and will hold more firmly, and are more permanent and durable than any other mode of fastening.

My invention consists in casting on the outside of the two halves ofthe bush, which form the socket for stem-casters, a faint hollow spiral, which, when the two halves are put together, makesfa fast-running screwthread, of sucient capacity to' holdl the bush very firmly in the hole made in the wood to receive it.y

Also, in so forming the upper end of the cavity in the bush, as to fit into a neck near the upper end of the stern,lwhereby it is prevented from coming out, While it turns freely, and has a substantial bearing on the end ofthe stem.

'lo enable others to make and use my improved stem-casters,` and bush,- or 'sockets to hold them in, I Will describethem more fully,` referring to the several figures in the drawings,rand to the letters' of reference marked thereon.

` The bush, or socketA A, for; the stem B of furniturecasters,'is cast'in two halves, the same as the plain ones in common use.

On the open end, G, I have a flange, D, which mayl be made with four, six, or eight sides, for the purpose of putting on a wrench to turn them into the wood, E.

On the outside of the long straight portion are cast faint hollows a a a a, so as to form a spiral screw-thread, coming to an edge suflieiently sharp to indent itself into the wood E as it is turned in.

In the cavity (l, of the bush A, is cast the proper form to fit thestem B, which has a neck, c, and head, d, or ball, so that when the two halves are put together', with the caster-stem in, it cannot come ont.

The hole in the wood being the proper size, they are as easily put in as a common wood-screw,and require -as great or a greater power to draw them out.

0n the small ends of chair or table-legs there may be sockets, F, or ferrules, to prevent themfrom splitting. f

'The advantages of my improvements are that they .cost no more to make than the ordinary stem-caster, are more easily fitted and put on, and are more secure,

permanent, and durable than any other mode of fastening.

Having thusfully described my invention,

Vhat I claim as new, and desire to secure by Eet/"- 

